Hmmm that is strange, your image looks the same as mine and when i download it is is named "original.jpg" did you attach the unedited one? my original is a little blurry so i sharpened which may have accented the noise, here is my smaller version i edited for my website, I think I like the softer focus less noise in this version, but I could up the contrast (via levels, right? you don't use bright/contrast do you?)
This one also fits my taste big time :) Now check this out, added more contrast which I always do for all night photography pictures, and burned a little to get rid of some noise in the sky, btw, if you wanted to get rid of the noise completely, you can try with neatimage.com, I am sure you will like it, Please check the attachement, Regards and a big welcome back,